We drove with auto-chains, put on in Boring, OR. They are helpful only if the powder is less than 4 inches, helpful pulling about 4% grades and downhills, and getting out of parking lots. You can drive about 40 mph with them down, full chains we did not run over 35. They make a nice Santa Claus sound going down the road. The sleeping driver just loves it. We ran Portland, OR to Reno daily and back hauling GM. Without the auto chains we had to put chains on and off at least 4 times a day, PITA. If 97 and 58 were closed we had to run 140 or the pass from Susanville to Mount Shasta. NOT FUN.
I did most of the driving on chains, while my hubby installed them when we did not have the auto chains. They gave me confidence as our loads only weighed 8-10,000 lbs, not enough weight to make a difference on hard pack.
When we install manual chains, we drape them over the top of the tires, bungee, I pull up the truck, and Kirk rebungees them tight and puts the chainlock in place. WE spraypainted the key flourescent because once it falls in the snow its history. We had two headlamps also, hanging from the post by the drivers side windshield, and safety vests. We yelled a lot at smart....s that would speed by us in the chain up areas blowing mess all over us while chaining. It is better to stop as soon as possible to install than wait and hope there is room for you at the front of the line. Use a fifth wheel puller (those of you in straights may not have these, but they are the best $10 to spend in the winter) to pull tight the chains to bungee. Have some IceMelt on hand. When those hot tires stop on the cold roadside you can become frozen in place.
I do not think auto chains would be very effective on I70, I80 when the snow is blowing and deep. It is not worth the risk.
Hope you aren't too bored by my comments, but I drove Tractor-trailers in Oregon and then across country for the major carriers and doubles as well as straights. It is safer to park it than to get hit by the speedy demons that think they are super duper ice road drivers in a storm. That goes for the home grown idiots in their excursions and the like thinking they are bad... with 4 wheel drive.
When in doubt, wait it out.
Kat